A metal film fixed resistor produced by BEC is a type of passive electronic component with a fixed, non-adjustable resistance value, constructed by depositing a thin, uniform film of metal (or metal alloy) onto an insulating ceramic substrate. It is a precision-focused resistor variant, offering better accuracy, stability, and low noise than carbon film/carbon composition resistors-making it a staple in consumer, industrial, and automotive electronics for signal-path, biasing, and moderate-power circuits.
Basic Parameters
|
Product Category |
Metal film fixed resistor |
|
Resistance Range |
0.1Ω~100MΩ |
|
Rated Power |
1/6W~5W |
|
T/C |
±5ppm/℃~±300ppm/℃ |
|
Tolerance |
±0.1%, ±0.25%, ±0.5%. ±1%, ±5% |
|
Certificate |
RoHS, REACH |
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Applications |
Audio equipment, precision measurement devices, telecom equipment, medical devices |
Characteristics
Substrate: High-purity 96% alumina (Al₂O₃) ceramic (insulating, thermally conductive, and mechanically rigid) to dissipate heat and prevent warping under thermal stress.
Resistive Layer: A μm-scale thin film (1–5μm) of nickel-chromium (NiCr) alloy (the most common) - or tin-oxide/tantalum-nitride for specialized use - deposited via sputtering/evaporation (ensures uniform film thickness for consistent resistance).
Laser Trimming: A helical groove is laser-cut into the film to trim resistance to the target tolerance (the single most important step for achieving high precision).
Terminations: Metal end caps (copper/nickel) with Pb-free solderable contacts (SMD) or axial lead wires (THT); a nickel barrier layer prevents corrosion/tin whiskering (critical for long-term reliability).
Protective Coating: Halogen-free glass-epoxy/epoxy overcoat that shields the film from moisture, dust, chemicals, and mechanical damage; laser-printed resistance/tolerance markings (on larger packages) are applied here.
Production Process
Parts of Our Production Facilities
FAQ
Q1: What tolerance and TCR values are available for metal film fixed resistors?
A1: Tolerance (precision) and TCR (Temperature Coefficient of Resistance, thermal stability) are tiered for different design needs-smaller values = higher precision/stability:
Tolerance Options:
±0.01%/±0.05%: Ultra-precision (test equipment, medical diagnostics, aerospace reference circuits).
±0.1%: De facto standard for most precision design (industrial controls, automotive signal paths, telecom).
±1%: Cost-effective precision (high-end consumer electronics, non-critical industrial circuits).
TCR Options
±5/±10 ppm/°C: Ultra-stable (high-temperature environments: automotive engine bays, industrial furnaces).
±25 ppm/°C: Standard precision (most common-telecom, computing, automotive infotainment).
±50/±100 ppm/°C: Cost-effective stability (low-temperature-variation circuits: consumer electronics, cabin automotive systems).
Q2: What is the operating temperature range of metal film fixed resistors?
A2: Virtually all industrial/automotive-grade metal film resistors have a wide operating temperature range of -55°C to +155°C-suitable for extreme thermal cycling in harsh environments (e.g., automotive engine bays, industrial enclosures, outdoor telecom equipment). Consumer-grade variants may have a slightly narrower range (-40°C to +125°C), but still far more robust than carbon film fixed resistors.
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